Solr doesn't index document translations after they are created on a subwiki

Follow these steps to reproduce:

• Create a subwiki if you don't have one already
• Make the subwiki multilingual, putting "en,fr" as supported languages
• With the default language create a new wiki page. I used a terminal page
• Search for this page using

  id:subwiki\:Space\.Page_*
  

  and removing all filters (selected facet values). You get one result as expected.

• Translate this page in French
• Perform the same search again. You get only one result although it should have been two.
• Edit the French translation and save.
• Perform the same search again. You now get two results as expected.

So the document translation is not indexed when it is created (on DocumentCreatedEvent). You need to re-save the translation in order to index it (DocumentUpdatedEvent).

This doesn't happen on the main wiki.